Sink fixture



FIG. 1 is a front, right perspective view of a sink fixture showing my new design;

FIG. 2 is a top plan view of the sink fixture in FIG. 1;

FIG. 3 is a left side elevation view of the sink fixture in FIG. 1; and,

FIG. 4 is a front elevation view of the sink fixture of FIG. 1.

In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design. 

I claim the ornamental design for sink fixture, as shown and described. 